强流强子直线加速器环形耦合结构加速模块物理设计优化综述
The Summary for Optimization of the Annular Coupled Structure Accelerating Module Physical Design for High Intensity Hadron Linac
摘要：
J-PARC高强度质子直线加速器的190-400 MeV部分采用了常规导电环形耦合结构（ACS）。ACS的工作频率为972 MHz。J-PARC ACS强烈基于以前的调查结果，特别是KEK的日本强子计划（JHP）研究计划的结果。但是，为了满足可靠性、运行效率和降低成本的要求，对设计进行了修改和优化。在总能量范围内优化了加速单元的单元形状，使其具有高的分流阻抗值，并与低耦合单元进行了精心的匹配。优化了桥式耦合器单元的设计以简化批量生产，并优化了RF输入单元的形状以及匹配窗口以提高工作可靠性。这些修改汇总调整后，效果显著。ACS模块设计在射频参数和尺寸上不输于其他可能的加速结构。以前开发的L波段ACS制造技术应用于972 MHz ACS建设。实现的解决方案有储备ACS模块使用非常高的热负荷在操作期间与15%的占空比，目前最高的热负荷，相比，加速模块与另一个正常的传导加速结构，实现在强子直线加速器。本报告包含J-PARC直线加速器ACS模块物理设计变更的描述和解释。
英文摘要：
The normal conducting Annular Coupled Structure (ACS) is applied for 190-400 MeV part of high intensity proton linac for the J-PARC. The ACS operating frequency is 972 MHz. The J-PARC ACS is strongly based on the results of previous investigations, especially results of Japan Hadron Project (JHP) research program in KEK. However, the design was revised and optimized to meet the requirements of reliability, operation efficiency and cost reduction. The cells shape of accelerating cells was optimized in total energy range to have high shunt impedance value together with the careful matching with the decreased coupling cells. The design of the bridge coupler cells was optimized to simplify mass production and shape of RF input cell together with matching window were optimized for higher operational reliability. Collected and adjusted all together, these modifications result in the significant effect. The ACS module design doesn't lose to another possible accelerating structures in RF parameters and dimensions. Previously developed for L-band ACS fabrication technique is applied to 972 MHz ACS construction. The realized solutions have the reserve for ACS module use with very high heat loading during operations with 15% duty factor, the highest heat loading at present time, as compared to accelerating modules with another normal conducting accelerating structures, realized in hadron linacs. This report contains the descriptions and explanations of changes in the ACS module physical design for the J-PARC linac.
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